Abstract
The trilepton signal with missing transverse energy ( 3ℓ+ E / T , with ℓ= e or μ) from chargino-neutralino ( χ ± 1 χ 0 2) associated production and decays is studied for the upgraded Fermilab Tevatron Collider with 2 TeV center of mass energy and integrated luminosity of 2 fb −1 (MI) to 20 fb −1 (TeV33). In some regions of parameter space in the minimal supergravity model, χ ± 1 and χ 0 2 decay dominantly into final states with τ leptons via real or virtual τ ̃ 1 sleptons. The contributions from τ−leptonic decays increase the trilepton signal from χ ± 1 χ 0 2 by at least a factor of two when soft but realistic cuts on lepton transverse momenta are used. With the Main Injector, a trilepton signal can be detected at tan β≡ v 2/ v 1∼3 for universal masses m 1/2, m 0≲ 200 GeV.
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